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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc611698841188bc19cac82972016090c6dcc92625a7081d32e417b8168ae5a6' 
  AND token = '9vF1xw9ofbUNBPMGZqpRQ40KEZx1AFeIm0vtePMUkHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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