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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3424c2fa73ba7d7ecf2c1d26bd6a77c9a7d7985241be588822c8e91011bb350' 
  AND token = 'dvG60kvAiWQh6xsc7rKnVdvVrf94oskJSNswtcYip5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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