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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a5ad906ed1f61ae0347f9a251f3a1dce5b3ffa3acedff86d64747717f0683ef6' 
  AND token = 'gr3+/qwnDO46RyEh+xcu9wFqkPNeVF9kkHimcgcKKhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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