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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '62b161095754c8ab06ffd0c6dcabe64613c12b9b7ea08d29c2a2b7a4418a7073' 
  AND token = 'EzXsvV+uP8eXbb0KSr1XE1vet/xo+Cfzw6CpQplMwJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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