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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '592b874d0679dc330da61b83c207f873de385f0162b22afc868783bd6ba056d8' 
  AND token = '6E9zj4UquZNfkYyfHd635HfOG8IOQ+3chl7gQe3YHSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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