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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '35a2d0aa19ad21b9a2bf441da521bf9232ae22ba194685c474507e1ba31ae3f3' 
  AND token = 'v4WsHVLVBGi1n/bFj0v0Gp739061/ndFEjLzC2E/IL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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