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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0b079b762395cfd0d0e051f8dfbb2fa04a699217ecf0b5443e71e530b7279646' 
  AND token = '9+dB8rUQmdmRgjmUSCaDDsxXKgdfS9Tyfz84TNZM2bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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