SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c37a0b0a19a05b4a4d0501ab58adb95c5d97bb7173fd8816853ebc04f3210d78' 
  AND token = 'yPVP9fhc5SUL9TZPWt/OnAFjRJT8qrWYDztC5Rot4Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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