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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5beb7b1816a127661389c3cfc521c942fa88f521f01c6d99f91243c02914fd4d' 
  AND token = 'aFIfUbsvWpQ1F4zp+skVSMu514KdOnwXum5JF5qg3U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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