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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '37b4dc200e21aae85a014db49b49ad57fcdf542397a5f35a6bb59baf598f4d36' 
  AND token = 'yd8oCcn6YNcokPTsrfK5iInF3WdrnNt4D1Zn4NJrhdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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