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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c77605f74c58928f865bde029ff721a7ec6c1cd59118dd479e1f4857f954e1ea' 
  AND token = '4Q7DTckroAmLAkzs2zzX1nbGHIFDdJAwLY/8R54XwSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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