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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de2a2951c21f1b2b643b58d2f60ac41b5bd3e9b7f2f352abce3adaf6efc82fb1' 
  AND token = '5DjWao5I5UcF6xvyXbbN1+Oa9kG4AQvXbU5qj9AnJkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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