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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e49d7a2574d5f233a8e9cb9435db8e951bbf3f11e3ee471f940ec5fd3af35b4a' 
  AND token = 'XdqyTq28Gwb7Xgl/XFK7KIxWpFbINnq951cBSpQC4Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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