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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '327a892567d822ad1ec3f3dcfe8f16e57632626ab16018c1dcdd9cd2cc4770e7' 
  AND token = '0mbkuzQ2gHkzeCwhczSkduCXe8SfL35JZqXYgGfJjaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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