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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '630939ecacb30234ba72a69e4daedf87e8f8e9c67739e4b55c2559a2eba05806' 
  AND token = 'LsStrFveBmVPbBqdkbxqAvnVpHc8/gYwhUTkO6409k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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