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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf4f99079fb68ab468d7b7b495a31379d1ea5c19888a34a6d2548724281e507c' 
  AND token = 'nCTtjWT15oZ/59NrXU8YD6FYHp6CeZpmcqPzQlmWUuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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