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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '735fb363ecc444e5547b7fe1dd354f014859a2ad4b9fc576ac2a9ad3f29b83b4' 
  AND token = 'P4mEQ1VLRohEEhNXFj811KjkrEl6edtbXU7HfnGzc78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}