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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '73165971c32c11728f6c78035bca86c21d1246e09a1c1c327d77596c5ebc3ebd' 
  AND token = 'LuM1+degfxRR75B08asKPp2MKKhx83h6l/R6GTl89Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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