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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7ea414eae12bcbd1878ff78fb79c7de4928fcc45fff9e5f1cb81e46fc16f0fa' 
  AND token = '4tc5uKv6bH+OULagXPV7W8UFXp/izZd7ZR0A1ezADFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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