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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f55ae7e5292eaa3a66f71bc99f07b417379c262ea3cd26e040117b0624664dae' 
  AND token = 'Wu/3hnMB1YYfChJUIKYJHPTAV2WXSh3N/r/A1t6aMQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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