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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9432f8e6d4c8ad15621b166a4acd2287199549d9cbe1e5c01bdb31145ef6155f' 
  AND token = '458Pz+575PvMGjaCDq+BE9UeawJuSyk6bxDZlu7oIWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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