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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6898ecc7a4fe29035e15294279dcae0ca08b352422f1759ec54b4109436e5bb' 
  AND token = 'BSOtP/fZ1W6S0EBnfRCnEVmWKjNL58zPG0Gb9xXMSyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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