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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34e829f9aeae494fe51e2224bbcded65c9ceecb3e2769b0f832d669713af199d' 
  AND token = 'JjgNW3ZncRRPsIdQ0O25L52tsR2rYvajBa+7Qz6SRDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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