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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '161e9558dabc3d442ebeac13694779173736c0762df6f126fc92bf803357256e' 
  AND token = 'fD+cv1r2J7DuYXV3qvyyC2k+wSZqQE6govWS3Xun12k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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