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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10db7e1172481d6c0299d8d33ded0bf0eb4ce56e09187ef6e587cfadcff36526' 
  AND token = 'SJgk9gJgSPTq6AmZeLa1YWyEhGEfnzx0021RwseipGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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