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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a1016775b2a0157c88514ec26b14efee7a92f2211f3d537f266192a9e2ab786c' 
  AND token = 'gl4W4sALY7UtuPZvvpbdkSOEfcFGBUuAyGn+vCBiuDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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