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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39f31493a99ef212fcbdcedd8f6d06b99a1cc2e48f40910f5cb6eac36eaf02b2' 
  AND token = 'aa+8wnAa34gURegMlmPay+eECv/7SUnVO9b/suo1NeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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