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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6a5c8d97e0eb8777ea6bfb00c0017e120922cb22c5d4f8288b70dac52bd2a55d' 
  AND token = 'EAJh9ixQh6N3nBTaQiZ3aBf2Pxxixfr1PvUUP3jWMbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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