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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a765a93e70bad88f387f587c00efde233c53930020d5c70938ed09eed51b338' 
  AND token = 'vzHoriyRTGa3gN6Pr2G1b4svIXJYh6F2sfJmzJjrHX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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