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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb710cd8d8f9337eab24db91412b14727d47290c3e9edb4207fcddf934e6cc7d' 
  AND token = 'mXYDDUzica6cYHKHjj3haROnQJUrQwkHMP09PPjITjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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