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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2b191c388143e6dfea0deb8f7b06dca6d006539d475fa882fb775ca19b981f8' 
  AND token = 'KLueQpxoNGs8G2gO5dtMXgg7CRLNFSu9fN2kOH4D7no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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