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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e1b6ff88cb6db716c230d0e6cb66870e4f2d6f1be8ec07aeec7b49809db661e' 
  AND token = 'OwOSGg907lq4e4+hhi/Aenuk5uElJXdpTC5YjeEadaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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