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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba40692da2321f20a20871a273f9b969ec74c1faa2b61a6f8baa07f59ebb5d09' 
  AND token = 'BrK9oUVLeP7q4Xrg3ApEO7F4tFW9lL+ldOO2chO7TQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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