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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1da9cae28c3ff8e007ba27b09820231eacfe28de10ad6a93af6cd291f7854dc8' 
  AND token = 'v0JY8H6U5Hu/dXkHxTRe9uvMVGq5RdCIrJHNIcDz/4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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