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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '96db9c252b4cdab8668440c98b9103c4744e92ef9eabf0f2d8ea14d2551700f0' 
  AND token = 'G4ol8sltceFHrEaGC3nAjAGAdbcxcmxdblwC0YnuosA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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