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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0804d484e77fb65495fe6706a4430a86cb34720367f4c010081431eaf3a3342e' 
  AND token = 'XLkbvU7g8Hfyrl4kzxErUmj1mTnYzLfzzL6r5QcMhmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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