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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7f85a7d54f1ae50c906c3cb4c903422831589d14a84a04d48cb100d356d77cd' 
  AND token = '7zP3SUOZ54Khus+/W6fHja00BhnxlRYdsyp5I7iV1kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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