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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c36d3b587fa9b32e42598930bdf54af18c7bf23dcb7056b44b3c1d9b83906db1' 
  AND token = 'fLMCTuy0/SaCihTC4jOI5Qun56BYE9xWTJCDQiz61oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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