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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '991c383a07cd907526c8c29b0b933a11d89c5cd335d2c5991f06a1db2566548f' 
  AND token = '0RF+D5XP9AbPB0xNMV422FjTbBnsVBJKJsFYrstABjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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