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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c500255f727b956362a06155fd1036a4b4220d5c8eae774b531c32c2de5ffe5e' 
  AND token = 'rta0Wtq+SeCXNF8up7oJnxaUbH5VNplYBQoG3rV+dfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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