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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b8e418076df116ab9a0c8220621acae7c467416b2cf44f50e61355739171f70' 
  AND token = 'PdqxQaPa8G/PE6XhDGMZdHbe0qE4Iq7EUunQ19scIwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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