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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '90eadd9e87680eb13ca76b0f4e5fea5e19f2023cbeedf7cf6ff00b13662f373a' 
  AND token = 'o+4ReNKjKx5W9AVQT+5hUmhJs3bmfrhup+Pwojlr1bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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