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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5b73676da6cf1ff37cc3bec16430cd96c6e04e8d7614813d4ba87fc657eb519' 
  AND token = 'rNRrPLYV1mX5Ej70KssZtAGvRJMgX0FDqnDet4jGYdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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