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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '115f7e11c7d1f3ddbbd2fdbcf046685320301f88ea8c9800309f4e2698f6736e' 
  AND token = '0uCIpmqWFQsCPDuFoTC5ZdixtiFdR3X99UVJHekEVzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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