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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '017b2c0d5c1365c0dba91f99d1c997840ee1003b35b151016b9a00367c50c4f9' 
  AND token = 'alX8KTlScSXvdGN/NRoaaEmsxowSV8S1fzOERxVZFy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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