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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f07e7fa1876577d48ff5543dcdfbd80e7c7128955d6457e2c7899b01f9e457c' 
  AND token = 'a1fIm4cJRjBOwvdl6Qn4g2hjYv8XdDMmwR9CFmUgjs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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