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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b969c9329fef75b560065382eaf67457b86b4f166963b597a9eb15c8ae8fe574' 
  AND token = 'byEypO9k4eZZ271bVreqW0rtfxYmj2iRyKQcF1IODOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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