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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f2d766c6d3faf26513f9e10b0f2e1d6e47dc3e15864f605f795e2920e312a84' 
  AND token = 'MEinCe+XSSYB9psI2vRPh9XRfz2JkywdRNwGT8ff8UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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