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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '235661d67e23b07484f3d2c4e792e05b1adfc454789fae867b98aacf32032e4e' 
  AND token = 'BvXAyfgwf4dZxWZcWMB2rMfD8aRTQjOuscIozgdzXHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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