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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39a5a58aace0af98a5605f7dc2c73f1b0b4198bd4e18b303acd2601d9acadaae' 
  AND token = 'pNdK7Sktx5U4jz73kD4kS87chtYssez6QgIkiQHFugs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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