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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1faf248cd167c20c1f5b51198edee680e82abf981e088a725db3add3349d9fcf' 
  AND token = 'g+6xuR0sYu4ZvxWPJ12Ud/TxeNumawLLPye9Nyainxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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