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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f670ff7df290ddc6b2901dc1a21efbd6c7faaad6ffb9e87792260bddd990241' 
  AND token = 'vTDxnceR5fZT03/RHH9YAFChN3jvr4hWJgx2AWavOUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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