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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '240b72b460e3e083ebfaf10fc82188da1b378966dc7e02b0b1aaf3238253ae14' 
  AND token = 'auRf4rvnpkwB4F+aMNtOlKUhx6Vs545aKL76d/h9U5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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