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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6dcea5ba09330ad2036d0513d09bfcaa520f8331b71addf1b0cbbbcefdb78ffe' 
  AND token = 'q9iGqTsdxa75YH+yHOFlIn0F4xGeoQDf1ho5ac4Dp50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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