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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f5431a5bb0000495cd6cd15e82d95a100e5f40c5d428a951cec3d602c182f6a' 
  AND token = 'yzEqUyAfxToAEBwctJPsVfQnOps+9PVg+gQKW4fH/4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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