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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1089b207aeaa235bdf066382c546322c6f2e4d55b536a4aaad3cc306d0e4a13' 
  AND token = 'lgkii/EUXbA207TesiicyDB/KmPTIFy+osZx8qAv8fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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