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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fe46a174a31ce7d55e3f321b111ab8c00e33e6316fae54dfe95a5e062c0977b' 
  AND token = 'cyKqoi8w4ese5lkdEjMcCsvMZ3coY9CyBNdj/bgpDxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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