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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c13f124c14f5089029cbbe85a93c6e5c8713b6b714e6be30bd1761c4fd67945a' 
  AND token = '4kQLgM3KCBA/h/j98v0oDphNAteOGyPTk7uF1XaoEWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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