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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10a1c1e15b430e62a635c89248b7f8c30dc3d8d0b6e8d8d668f086da2d3eb898' 
  AND token = '0TYIgIJvgcq5jHfVe4iPM6NhRGnTyArpzyWstXvifnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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