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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5817c39385ccca7b8cb3a25e813c2556367fc6c9857b02d46f56815dcd83c05' 
  AND token = '2tYAauwIl16DF8tZvT5wM1ks/LrVKlZmPqQaC6r6jDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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