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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '00416a7ee5f1fdb01e833ea59c3d1261b8e52e45c0a4a8119b3d28c03e834688' 
  AND token = 'iSUwHvjmboxbbg7osLdMrP3T0dlW0tFwRefaRlFTzVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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