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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2e6abd38c76cf43b30cd74ccf9743a0869e399c0b74056bf0b353d62bb9a3dc' 
  AND token = '4kbDZkKVZIjZsml4MFNvk2CoG2Bm8rjhQNifcJMbM8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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