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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '02a5aaa9e1e0c8b77a2ba82af21b201725bff0890d7394a9e9959daed10a4e9c' 
  AND token = 'lUmeD4IAMwK1Jl/Hjy5u1S/kYaSliDj6REvuYv2l6DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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