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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c5cf3976e06ae671c9bb07e9c6cdbaa8d3344845c726481b0d25a4330ffc235e' 
  AND token = 'Lj16U/9N7nYxCztaUnY86BrSvId/08CN6DaGaNaCwXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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