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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fdc01563d00b3b3779ab120bf332bff3c0a06b7126a7b04b03cabeb8ec2d5adb' 
  AND token = 'dDn9ajeP1wl+8oA3xErqZInS4UoeXALSnLHupjeRvEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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